/*
 * FreeRTOS+TCP V2.3.2
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

/* Standard includes. */
#include <stdint.h>

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
#include "semphr.h"

/* FreeRTOS+TCP includes. */
#include "FreeRTOS_UDP_IP.h"
#include "FreeRTOS_Sockets.h"
#include "NetworkBufferManagement.h"

/* Hardware includes. */
#include "hwEthernet.h"

/* Demo includes. */
#include "NetworkInterface.h"

#if ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES != 1
    #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer )    eProcessBuffer
#else
    #define ipCONSIDER_FRAME_FOR_PROCESSING( pucEthernetBuffer )    eConsiderFrameForProcessing( ( pucEthernetBuffer ) )
#endif

/* When a packet is ready to be sent, if it cannot be sent immediately then the
 * task performing the transmit will block for niTX_BUFFER_FREE_WAIT
 * milliseconds.  It will do this a maximum of niMAX_TX_ATTEMPTS before giving
 * up. */
#define niTX_BUFFER_FREE_WAIT       ( ( TickType_t ) 2UL / portTICK_PERIOD_MS )
#define niMAX_TX_ATTEMPTS           ( 5 )

/* The length of the queue used to send interrupt status words from the
 * interrupt handler to the deferred handler task. */
#define niINTERRUPT_QUEUE_LENGTH    ( 10 )

/*-----------------------------------------------------------*/

/*
 * A deferred interrupt handler task that processes
 */
extern void vEMACHandlerTask( void * pvParameters );

/*-----------------------------------------------------------*/

/* The queue used to communicate Ethernet events with the IP task. */
extern QueueHandle_t xNetworkEventQueue;

/* The semaphore used to wake the deferred interrupt handler task when an Rx
 * interrupt is received. */
SemaphoreHandle_t xEMACRxEventSemaphore = NULL;
/*-----------------------------------------------------------*/

BaseType_t xNetworkInterfaceInitialise( void )
{
    BaseType_t xStatus, xReturn;
    extern uint8_t ucMACAddress[ 6 ];

    /* Initialise the MAC. */
    vInitEmac();

    while( lEMACWaitForLink() != pdPASS )
    {
        vTaskDelay( 20 );
    }

    vSemaphoreCreateBinary( xEMACRxEventSemaphore );
    configASSERT( xEMACRxEventSemaphore );

    /* The handler task is created at the highest possible priority to
     * ensure the interrupt handler can return directly to it. */
    xTaskCreate( vEMACHandlerTask, "EMAC", configMINIMAL_STACK_SIZE, NULL, configMAX_PRIORITIES - 1, NULL );
    xReturn = pdPASS;

    return xReturn;
}
/*-----------------------------------------------------------*/

BaseType_t xNetworkInterfaceOutput( NetworkBufferDescriptor_t * const pxNetworkBuffer )
{
    extern void vEMACCopyWrite( uint8_t * pucBuffer,
                                uint16_t usLength );

    vEMACCopyWrite( pxNetworkBuffer->pucBuffer, pxNetworkBuffer->xDataLength );

    /* Finished with the network buffer. */
    vReleaseNetworkBufferAndDescriptor( pxNetworkBuffer );

    return pdTRUE;
}
/*-----------------------------------------------------------*/
